#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <cerrno>
#include "Log.hpp"
#include "InetAddr.hpp"
#include "Command.hpp"
using namespace LogModule;

const static int gsockfd = -1;
// const static std::string gdefaultip = "127.0.0.1"; // 表示本地的主机
const static uint16_t gdefaultport = 8080;

class UdpServer
{
public:
    UdpServer(uint16_t port = gdefaultport)
        : _sockfd(gsockfd), _addr(port)
        ,_isrunning(false)
    {
        LOG(LogLevel::INFO) <<"Using port" << port;
    }

    void InitServer()
    {
        // 1，创建socket
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }

        LOG(LogLevel::INFO) << "socket success, sockfd is:" << _sockfd;

        // 2,填充网络信息，并bind绑定
        // 2.1，有么有吧socket信息设置进入内核？？？没有，只是填充了结构体！
        // struct sockaddr_in local;
        // bzero(&local, sizeof(local));
        // local.sin_family = AF_INET;
        // local.sin_port = ::htons(_port);//要发送给对面的，即发送到网络中
        // local.sin_addr.s_addr = INADDR_ANY;
        // loacl.sin_addr.s_addr = ::inet_addr(_ip.c_str());// 1. string ip->4bytes 2. network order //TODO

        // 2.2bing:
        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind:" << strerror(errno);
            Die(BIN_ERR);
        }
    }

    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char inbuffer[1024]; // string
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer); // 必须设定
            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer), 0, CONV(&peer), &len);
            if (n > 0)
            {
                // 1,消息内容 &&谁给我发的
                // uint16_t clientport = ::ntohs(peer.sin_port);
                // std::string clientip = ::inet_ntoa(peer.sin_addr);

                InetAddr cli(peer);
                inbuffer[n] = 0;

                std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port()) + " # " + inbuffer;

                LOG(LogLevel::DEBUG) << clientinfo;

                std::string echo_string = "echo# ";
                echo_string += inbuffer;

                ::sendto(_sockfd, echo_string.c_str(), echo_string.size(), 0, CONV(&peer), sizeof(peer));
            }
        }

        _isrunning = false;
    }

    ~UdpServer()
    {
        if (_sockfd > gsockfd)
        {
            ::close(_sockfd);
        }
    }

private:
    int _sockfd;
    InetAddr _addr;

    // uint16_t port;//服务器未来的端口号
    // std::string _ip; //服务器所对应的ip
    bool _isrunning; // 服务器运行状态
};

#endif
